Stoker



Nov. 9 1926.

I F. P. ROESCH STOKER Filed August 5, 1924 3 Sheets-Sheet 1 V I INVENTOR Nov. 9 1926. l,606,182

F. P. RoEscH STOKER Filed August 5, 1924 5 Sheets-Sheet 5 m M Wmiiiiiiii ul. A oRNEYs Patented Nov. 9, 1926.

FRANK P. ROESCH, OF CHICAGO, ILLINOIS, .ASSIGNOR TO STANDARD STOKER COM- PANY, IN COEPORATED, A CORPOBATION OF DELAWARE.

STOKER.

Application filed August 5, 1924. Serial No. 730,170.

This invention relates to locomotive stokers and particularly to that type of stoker wherein coal isconveyed from the tender to the locomotive fire box through a tube or conduit, there being suitable mechanism in the tube, such as a Screw, for moving the coal therethrough.

The numerous objects and advantages of my invention will appear in the following description taken in connection with the accompanying drawing wherein,

Fig. 1 is a diagrammatic view, partly in section and partly broken away, of a locomotive having embodied therein, one form of my invention.

` Fig. 2 is an enlarged sectional View of the locomotive fire box taken on line 2-2 of Fig. 1 and looking downwardly at the main grate and the dellvery end of the coal conveying conduit; the protecting lgrate which surrounds the delivery end of the conduit being removed.

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 2 showing in elevation the central, grate Supporting, bar.

Fig. 4 is an enlarged detailed view of the delivery end of thefcoal conveying conduit and showing the protecting grate surrounding the conduit.

Fig. 5 is a section on the line 5-5 of Fig. 4, certain of the parts being shown in elevation.

The type of stoker disclosed in the drawings is one in which the fuel is delivered to the fire through a tube or conduit which enters the fire box beneath the grate and thence passes upward through the grate and terminates in a delivery Opening above the fire, there being suitable means, such as steam jets, for spreading the fuel over the fire as it pass out of the delivery opening. In this type of stoker it is customary to provide an auxiliary or protecting grate around i' the upper end of the delivery conduit. This auxiliary grate is usually similar to a skirt in form, It fits around the upper end of the conduit and extends outwardly and downwardly to the main grate and forms a s ace between the auxiliary grate and conuit, which space is covered at its to and usually opens downwardly to the as pit. This space is normally supplied with air which passes into the combustion chamber through openings in the auxiliary grate, thus assistmg in the complete combustlon of the 'preven-ts the conduit, as well as the auxiliary fuel. The auxiliary grate keeps the fire away from the delivery conduit and the current of air flowing through the space between the conduit and the auxiliary grate I W) grate, from becoming overheated; Inasmuch as this space is covered at the top, coal whlch passes out of the delivery Opening cannot fall into this space, but instead is forced by the steam jets over the auxiliary grate onto the fire.

The present invention seeks to overcome certain objectionable features present in. prior locomotive stoker constructions of the character above described.

A steam locomotive comprises a longitudinal frame which serves as a support for the boiler and fire box construction. The boller is rigidly secured to its frame at its forward end and is permitted at its 'rear end to move on the frame so as to take care of expansion and contraction of the boiler. When a stoker construction as above described is applied to a steamlocomotive, it has in the past been customary to secure the upwardly extending portion of the fuel delivery conduit, at its lower end, to the locomotive frame and to support the auxiliary grate on the fire' box construction. Inasmuch as there is considerable movement of the fire box on the-frame, the auxiliary grate which tends to move with the fire box will be pushed against the upper end of'the conduit, thus hending or displacing the conduit. In the embodiment of' the invention herein disclosed, I prevent this tendency to bend or displace the conduit by providing a construction which will permit a considerable movement of the auxiliary grate and which at the same time will maintain the space be- :tween the auxiliary grate and conduit closed so as to prevent coal from fallinginto this space.

Referring now in detail to the drawings,

Fig. 1 represents a locomotive comprising a boiler 10 having a fire box 11 and 12 represents a main Supporting frame of the locomotive. The cylinders 14 are formed rigid with the frame 12 at its forward end and these c 'linders are rigidly secured at 16 to the orward end of the-boiler. Yarious meansmay be provided for supportin the boiler rear of its forward end on the ame 12 so as to permit longitudinal movement between the two. Inthe construction` HQ shown, such means comprises 'plates 17 which may bend longitudinally of the boiler, and at the same time, be sufiiciently strong in a Vertical direction to support the 'are secured to the sides of the fire box. The

central bar 25 is forked at its rear end as shown at Fig. 2, and the rear grate bars 22, which are journaled inv the forked portion of the bar 25, are somewhat shortenthan the remaining bars 21, thus leaving an Opening 28 in the 'main grate. Bars 24 and 25 are supported at their outer ends by lugs 29 secured to thefire box walls and at their inner ends by a transverse bar 32 secured at its ends to the side walls of the fire box.

35 represents a conveyor tube or conduit which extends forwardly from the tender under the deck 36 of the locomotive and under the mud ring 37 of'the boiler into the ash pit 38. FromY this point it `is formed with an u wardly extending portion 39 which termmates in the delivery Opening 40 above the normal level of the fire. The conduit 35 i's provided with suitable means not shown for forcing the coal therethrough and delivering the same through the opening 40. As the coal passes from the Opening 40, it is caught by steam jets which issue through openings 45, formed in a casting 46 loeatedabove the opening 40 and is carried by these jets laterally over the fire.

Partially surrounding the upper end of the portion 39 of the conduit is an auxiliary or protecting grate 447, which comprises east metal sections 48 and 49, both of which are \spaced from the conduit 35 and form`a 'chamber 50 which opens downwardly into the ash pit' 38. Section 49 of the rotecting grate 1s supported on the forke portion of the bar 25, this section being provided with lugs 51 at its lower edge to maintain the section in position on the bar 25. The section 48 rests on the top of section 49 and is formed with lugs similar to lugs 51 for the purpose of preventing lateral movement of the section 48 on section 49. Lightly fittlng the top of the portion 39 of the conduit and resting at itsinner edge on lugs pro] eeting from the outer face of the conduit 37 is a metal plate is smooth an in the form illustrated, is flat. The plate 53 is preferably thickened somewhat around its central Opening and 'rlbs 54 extend from the thickened portion outwardly to the outer edge of the plate. As shown in Fig. 5, the plate 53 is supported some distance above the top of the grate plate 53. The top of the section 48. The grate sections 48 and 49 are formed with openings 56 and these openings, together with Ithe Opening between the top of the grate section 48 and the plate 53, serve to permit air which enters the chamber 50 from the ash pit to flow outwardly into the combustion chamber, thus ssilsting in the complete combustion of the ue through the chamber 50 .intothe combustion chamber, serves to maintain the conduit 39, plate 53, and 'grate 47 Cool.

From the above construction, it will be seen that in case the grate 47 moves relatively to the conduit 53, under the influence of the expansion and contraction of the boiler 10, that the grate,47 will merely move' Furthermore, this air in passing 4 under the plate 53and will not move the f,

plate nor the upper end of the conduit 39.

' While I have shown the portion 39 of n the conduit 35 as Vertical, it will be understood that in certain constructions the portion 39 may beinclined to the Vertical.

I claim: v 1. In a loeomotive, a main Supporting frame, a boiler and fire box construction mounted thereon, a conduit for delivering I fuel to said fire box, comprising an upwardly extending portion lrigidly secured to said frame and terminating in a fuel delivery Opening in the combustion chamber, a proteeting grate mounted on said boiler and fire box construction and forming with said conduit a downwardly open space about said conduit, and means covering the space between said grate and conduit at the delivery opening, the parts being so arranged that relative movement between conduit due to the expansion of said boiler and fire vbx construction is permitted.

2.' In a locomotive, a main Supporting frame, a. boiler and fire box construction mounted thereon, a conduit for delivering fuel to said fire box, comprising an upwardlyfextending portion rigidly secured to said frame and terminating in a fuel delivery Opening in the combustion chamber, a protecting grate mounted on said boiler and fire box construction and forming with said conduit 'a` downwarfdly open space about said conduit, and a plate surrounding and fitting the delivery end of said conduit and extending over the top of said grate, said parts being so 'spaced and arranged that rel-V frame and terminating in a fuel delivery f opening in the combustion chamber, a prosaid grate and tecting 'grate mounted 'on said boiler and fire box construction and forming with said conduit a downwardly open space about said conduit, and a plate carried by and surrounding the delivery end of said oonduit, said plate extending over the 'top of said grate and spaeed therefrom so as to permit relative movement between said grate and conduit due to the'expansionof said boiler and fire box construction.

4. In a locomotive, a main Supporting frame, a boiler and fire box construction mounted thereon, a conduit for delivering fuel to said fire box, comprising an upwardly extending portion rigidly secured to said frame and terininating in a fuel delivery opening in the combustion chamber, a protecting grate mounted on said boiler and fire box construction, and a plate surrounding and fit-ting the delivery end of said conduit and forming with said conduit a downwardly open space about said conduit, said plate extending over the upper portion of said grate and being formed with ribs on its under surface whereby an air passage is provided between the grate and plate, and all of said parts being so arranged as to permit relative movement .between said grate and conduit as the boiler and fire box construction expands -and contracts.

'5. In combination with a fire box, an upwardly extending conduit adapted to deliver coal thereto, a proteeting grate surrounding and spaced from said conduit, and a plate covering the space between the grate and conduit, the parts'being formed to permit the passage of air between said plate and the upper edge of said grate,l and the grat-e and conduit parts being spaced and arranged vto permit relative movement between them due to expans-ion and contraction of the Supporting constructions for said arts.

P 6. In a locomotive, a main lSupporting frame, a boiler and fire box construction mounted thereon, a conduit for delivering fuel to said fire box, comprising an upwardly extending portion secured to said frame and terminating in a` fuel delivery Opening in the combustion chamber, a Protecting grate construction mounted upon said boiler and fire box construction and surrounding and spaced from said conduit, and means covering the space between said grateyconstruction and conduit m such a mannelj as will permit a relative movement between said conduit and grate construction.

FRANK P. Ro'soi-i. 

